请问两道XDF的题

1. if P and Q are each circular regions, what is the radius of the larger of these region?

1) the area of P plus the area of Q is equal to 90 pai.

2) The larger circular region has a radius that is 3 times the radius of the smaller circular region.

Answer is C, my choice is E, because I caculated the value of P can 3 or 9.

2. What is the ratio of x:y:z?

1) z=1 and xy=32

2)x/y=2 and z/y=1/4

Answer is B, my choice is C. how x/z=8, x/y=2 and z/y=1/4 can get the the ratio of x,y and z?

1.我觉得C是可以的 因为题目没有问P或者Q具体哪个大些 只问the larger 那答案就是9啦

2.x/y=2 x=2y  z/y=1/4 z=1/4y

x:y:z=2y:y:1/4y=2:1:0.25=8:4:1 2)足够推出xyz的比

嗯^^^^, 楼上说得有道理